The inheritance of resistance to Xanthomonas campestris pv. translucens (J.J.R.) Dowson in barley

Abstract

Inheritance of resistance to bacterial leaf streak was investigated in 23 barley cultivars. Parents, F1s and F2s of one complete dialiel set with six varieties and those of 23 other crosses were tested with one Montana isolate (X-67) of Xanthomonas campestris pv. translucens in the field. An inoculation method is described which result in a uniform level of infection. Barley cultivars, Herta, Summit, Oderbrucker, Betzes, Alpine, Luther, CI 12558, CI 12569, CI 12595, CI 12777, CI 12787, CI 12866, CI 13095, PI 382511, PI 382650, PI 382720, PI 382732, and PI 383077 were found to be promising sources for resistance to bacterial leaf streak. Resistance in these cultivars varied with regard to gene action and number. Some of them may have identical genes or differrent genes in the same chromosomes. Further study is needed to determine identical, linked, and independent genes. Also, a close relation, wich suggests a linkage, was found between earliness and susceptibility.